# All files / middleware resourceLimits.js

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     /**
     * Resource Limits Middleware
     * Validates if tenant can create more resources based on their plan limits
     */

    const { pool } = require('../config/database');
    const { logger } = require('../config/logger');

    /**
     * Check if tenant has reached resource limit
     * @param {string} resourceType - Type of resource (stores, users, departments, contacts, conversations, devices)
     */
    const checkResourceLimit = (resourceType) => {
      return async (req, res, next) => {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          // Get tenant limits
          const [tenants] = await pool.execute(
            'SELECT * FROM tenants WHERE id = ?',
            [tenantId]
          );

          if (tenants.length === 0) {
            return res.status(404).json({
              success: false,
              message: 'Tenant not found'
            });
          }

          const tenant = tenants[0];

          // Map resource types to limit columns and table names
          const resourceConfig = {
            stores: {
              limitColumn: 'max_stores',
              table: 'stores',
              name: 'stores'
            },
            users: {
              limitColumn: 'max_users',
              table: 'users',
              name: 'users'
            },
            departments: {
              limitColumn: 'max_departments',
              table: 'departments',
              name: 'departments'
            },
            contacts: {
              limitColumn: 'max_contacts',
              table: 'contacts',
              name: 'contacts'
            },
            conversations: {
              limitColumn: 'max_conversations',
              table: 'conversations',
              name: 'conversations'
            },
            devices: {
              limitColumn: 'max_devices',
              table: 'devices',
              name: 'devices'
            }
          };

          const config = resourceConfig[resourceType];

          if (!config) {
            logger.error('Invalid resource type', { resourceType });
            return res.status(400).json({
              success: false,
              message: 'Invalid resource type'
            });
          }

          const limit = tenant[config.limitColumn];

          // If limit is -1 or null, it's unlimited
          if (limit === -1 || limit === null) {
            return next();
          }

          // Check current usage
          const [result] = await pool.execute(
            `SELECT COUNT(*) as count FROM ${config.table} WHERE tenant_id = ?`,
            [tenantId]
          );

          const currentCount = result[0].count;

          if (currentCount >= limit) {
            logger.warn('Resource limit reached', {
              tenantId,
              resourceType,
              currentCount,
              limit
            });

            return res.status(403).json({
              success: false,
              message: `You have reached the maximum number of ${config.name} (${limit}) allowed by your plan. Please upgrade your plan to add more.`,
              error: 'RESOURCE_LIMIT_REACHED',
              data: {
                resource: resourceType,
                current: currentCount,
                limit: limit
              }
            });
          }

          // Add limit info to request for reference
          req.resourceLimit = {
            resource: resourceType,
            current: currentCount,
            limit: limit,
            remaining: limit - currentCount
          };

          next();
        } catch (error) {
          logger.error('Error checking resource limit', {
            error: error.message,
            resourceType
          });
          return res.status(500).json({
            success: false,
            message: 'Error checking resource limits'
          });
        }
      };
    };

    /**
     * Check if feature is enabled for tenant's plan
     * @param {string} featureName - Name of the feature (whatsapp_enabled, ai_enabled, etc.)
     */
    const checkFeatureEnabled = (featureName) => {
      return async (req, res, next) => {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || req.user?.tenant_id;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              message: 'Tenant ID not found'
            });
          }

          // Get tenant plan features
          const [tenants] = await pool.execute(
            `SELECT t.*, sp.${featureName}
             FROM tenants t
             LEFT JOIN subscription_plans sp ON t.plan_id = sp.id
             WHERE t.id = ?`,
            [tenantId]
          );

          if (tenants.length === 0) {
            return res.status(404).json({
              success: false,
              message: 'Tenant not found'
            });
          }

          const tenant = tenants[0];
          const isEnabled = tenant[featureName];

          if (!isEnabled) {
            logger.warn('Feature not enabled for tenant', {
              tenantId,
              featureName
            });

            return res.status(403).json({
              success: false,
              message: `This feature is not available in your current plan. Please upgrade to access ${featureName.replace('_enabled', '').replace('_', ' ')}.`,
              error: 'FEATURE_NOT_ENABLED',
              data: {
                feature: featureName
              }
            });
          }

          next();
        } catch (error) {
          logger.error('Error checking feature access', {
            error: error.message,
            featureName
          });
          return res.status(500).json({
            success: false,
            message: 'Error checking feature access'
          });
        }
      };
    };

    module.exports = {
      checkResourceLimit,
      checkFeatureEnabled
    };